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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 Customer | Dec. 31, 2011 Customer | Dec. 31, 2010
Summary Of Significant Accounting Policies [Line Items] |  |  |
Recorded remeasurement losses for foreign currency exchange rate | $ 700,000 | $ 700,000 | $ 1,000,000
Cash and cash equivalents maximum maturity | 3 months | 3 months | 3 months
Max percentage of receivable from customer |  | 10.00% |
Number of customers accounted for greater than ten percent of accounts receivable balance | 0 | 0 |
Revenue recognition period, associated with service and maintenance agreement | 1 year |  |
Percentage of revenue recognized upon completion contract method | 100.00% |  |
Depreciation and amortization expense | 15,200,000 | 13,900,000 | 10,000,000
Advertising expense | 500,000 | 800,000 | 400,000
Stock-based compensation | 18,926,000 | 20,913,000 | 15,539,000
Forward exchange contracts maturity term description | The Company's forward exchange contracts generally have maturities of between one and three months |  |
Tax benefit realized upon settlement | 50.00% |  |
Furniture and fixtures [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment estimated useful life | 5 years |  |
Machinery and equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment estimated useful life | 4 years |  |
Leasehold Improvements [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment leasehold improvements useful lives | Shorter of remaining lease term or remaining useful life of ten years |  |
ILS [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Forward exchange contract to buy | 3,200,000 |  |
Forward exchange contracts to sell |  | 4,300,000 |
Euros [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Forward exchange contracts to sell | 5,600,000 | 6,900,000 |
Pounds [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Forward exchange contracts to sell | 2,200,000 | 5,700,000 |
Yen [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Forward exchange contracts to sell | 3,300,000 |  |
Software [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment estimated useful life | 3 years |  |
Software Development [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Internal use software development cost capitalized | $ 800,000 | $ 1,100,000 | $ 1,000,000
Comcast [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Entity-Wide Revenue, Major Customer, Percentage | 12.00% | 11.00% | 17.00%

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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